this isn't about the manual vs. constant per se, but in my experience, the DRL's M-B's are not set the way other cars are. in most other cars, the drl is simply the high-beam filament of the headlamp at 1/2 power, or by itself. M-B's DRL are essentially all running lights at normal power. no other manufacturer, to my knowledge, does this.

this becomes an issue when people are too ignorant to realize that DAYTIME running lights are for DAYTIME use only (hence the name) and that no other lights come on.

Fortunately, M-B had the foresight to avoid this problem.

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'94 W124.036 249/040 leder; 8.25x17 EvoIIs
'93 W124.036 199/040 leder; 8.25x17 EvoIIs, up in flames...LITERALLY!
'93 W124.036 481/040 leder; euro delivery; 8.25x17 EvoIIs
'88 R107.048 441/409 leder; Euro lights
'87 W201.034 199/040 leder; Euro lights; EvoII brakes; 8x16 EvoIs - soon: 500E rear brakes
'70 R113.044 050/526; factory alloys; Euro lights